This weekend’s Goodwood Festival of Speed may not seem like the venue to debut a plug-in hybrid concept car, but hey, it takes place in Britain and Jaguar is a British company, so why not? In addition to running a prototype F-type roadster in Goodwood’s hill climb event, Jaguar brought along an experimental XJ sedan powered by a plug-in hybrid powertrain. It’s called the XJ_e and Jaguar claims it vastly outperforms the regular XJ when it comes to fuel economy.

In place of the standard XJ’s six- and eight-cylinder gas and diesel engines, the XJ_e gets the turbocharged, 2.0-liter four-cylinder from the Range Rover Evoque, an eight-speed automatic transmission, and an electric motor. Jaguar says the electric powerplant puts out 93 hp, and is fed by a 12.8-kWh lithium-ion battery.

Total system output is 329 hp—Jaguar doesn’t specify the four-cylinder engine’s output, but it makes 240 hp in the Evoque—and the large-ish battery pack can propel the XJ_e up to 25 miles on electric power alone. The engine and electric motor work in tandem, making the big XJ a parallel hybrid (think Chevy Volt). Jaguar claims the XJ_e uses 3.2 liters of fuel to travel 100 kilometers, which translates to roughly 73.5 mpg—though it should be noted that this number comes from a European test cycle, which is generally wildly optimistic. Jag says the electrified XJ can travel up to 679 miles on a single tank of gas, all while maintaining the cat-like moves of normal XJs. According to the company, the hybrid can sprint to 60 mph in less than 6.5 seconds.

Although a hybridized production XJ hasn’t been officially announced, Jaguar’s announcement of the XJ_e does describe the experimental car as highlighting “that [Jaguar-Land Rover] customers can expect some exciting low-carbon products in the future.” We’ll just have to wait and see whether a plug-in kitty is coming our way; fuel-economy standards aren’t getting any looser, so there’s a chance.